
/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 *版权所有2002-2018原作者。
 *
 *根据Apache许可证2.0版（“许可证”）获得许可；
 *除非符合许可证，否则不得使用此文件。
 *您可以在以下地址获取许可证副本：
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 *除非适用法律要求或书面同意，软件
 *根据许可证分发的内容是按“原样”分发的，
 *无任何明示或暗示的保证或条件。
 *有关管理权限和
 *许可证下的限制。
 */

package org.springframework.beans.factory.support;

import org.springframework.beans.BeanMetadataAttributeAccessor;
import org.springframework.util.Assert;

/**
 * Qualifier for resolving autowire candidates. A bean definition that
 * includes one or more such qualifiers enables fine-grained matching
 * against annotations on a field or parameter to be autowired.
 *
 * @author Mark Fisher
 * @author Juergen Hoeller
 * @since 2.5
 * @see org.springframework.beans.factory.annotation.Qualifier
 */
/**
 *用于解析自动连线候选项的限定符。一个bean定义
 *包含一个或多个这样的限定符，可实现细粒度匹配
 *针对要自动连线的字段或参数上的注释。
 *
 *@作者Mark Fisher
 *@作者Juergen Hoeller
 *@自2.5
 *@参见org.springframework.beans.factory.annotation.Qualifier
 */
@SuppressWarnings("serial")
public class AutowireCandidateQualifier extends BeanMetadataAttributeAccessor {

	/**
	 * The name of the key used to store the value.
	 */
	/**
	 *用于存储值的键的名称。
	 */
	public static final String VALUE_KEY = "value";

	private final String typeName;


	/**
	 * Construct a qualifier to match against an annotation of the
	 * given type.
	 * @param type the annotation type
	 */
	/**
	 *构造一个限定符以与
	 *给定类型。
	 *@param类型注释类型
	 */
	public AutowireCandidateQualifier(Class<?> type) {
		this(type.getName());
	}

	/**
	 * Construct a qualifier to match against an annotation of the
	 * given type name.
	 * <p>The type name may match the fully-qualified class name of
	 * the annotation or the short class name (without the package).
	 * @param typeName the name of the annotation type
	 */
	/**
	 *构造一个限定符以与
	 *给定的类型名称。
	 *＜p＞类型名称可能与
	 *注释或短类名（没有包）。
	 *@param typeName注释类型的名称
	 */
	public AutowireCandidateQualifier(String typeName) {
		Assert.notNull(typeName, "Type name must not be null");
		this.typeName = typeName;
	}

	/**
	 * Construct a qualifier to match against an annotation of the
	 * given type whose {@code value} attribute also matches
	 * the specified value.
	 * @param type the annotation type
	 * @param value the annotation value to match
	 */
	/**
	 *构造一个限定符以与
	 *其｛@code value｝属性也匹配的给定类型
	 *指定值。
	 *@param类型注释类型
	 *@param value要匹配的注释值
	 */
	public AutowireCandidateQualifier(Class<?> type, Object value) {
		this(type.getName(), value);
	}

	/**
	 * Construct a qualifier to match against an annotation of the
	 * given type name whose {@code value} attribute also matches
	 * the specified value.
	 * <p>The type name may match the fully-qualified class name of
	 * the annotation or the short class name (without the package).
	 * @param typeName the name of the annotation type
	 * @param value the annotation value to match
	 */
	/**
	 *构造一个限定符以与
	 *其｛@code value｝属性也匹配的给定类型名称
	 *指定值。
	 *＜p＞类型名称可能与
	 *注释或短类名（没有包）。
	 *@param typeName注释类型的名称
	 *@param value要匹配的注释值
	 */
	public AutowireCandidateQualifier(String typeName, Object value) {
		Assert.notNull(typeName, "Type name must not be null");
		this.typeName = typeName;
		setAttribute(VALUE_KEY, value);
	}


	/**
	 * Retrieve the type name. This value will be the same as the
	 * type name provided to the constructor or the fully-qualified
	 * class name if a Class instance was provided to the constructor.
	 */
	/**
	 *检索类型名称。该值将与
	 *提供给构造函数或完全限定的
	 *如果向构造函数提供了class实例，则返回类名。
	 */
	public String getTypeName() {
		return this.typeName;
	}

}
